Question

The melting of a solid is an_____ process because heat energy is _____. the melting of a solid is an_____ process because heat energy is _____. endothermic/released endothermic/absorbed exothermic/absorbed exothermic/released

Answer 1

Answer: Option (b) is the correct answer.

Step-by-step explanation:

A chemical process in which there will be absorption of heat by the reactant molecules is known as an endothermic reaction.

For example,
`A + B + Heat \rightarrow AB`

When a solid melts then actually heat energy is absorbed by it due to which bond between its molecules break. As a result, molecules start to move from their initial position as kinetic energy is gained by them.

As a result, solid state of substance changes into liquid state.

On the other hand, a chemical reaction in which there occurs release of heat is known as an exothermic reaction.

For example,
`A + B \rightarrow AB + Heat`

Therefore, we can conclude that the melting of a solid is an endothermic process because heat energy is absorbed.

Answer 2

The answer is endothermic/absorbed. Evaporation, boiling, and sublimation are also endothermic processes like melting since they require an input of energy. On the other hand, freezing, solidification, crystallization, and condensation, are exothermic processes because heat energy is released to the environment.